GIMP Chroma Key Tutorial with GAP
GAP is a useful plug-in for GIMP, and it can be used for things other than animation and video. With that in mind, here's a quick tutorial on how to remove a Chroma Key green screen background with GIMP and the GAP bluebox filter. Get the GAP plug-in here: http://photocomix-resources.deviantar... for GIMP 2.6 and Windows 7
Linux users here: http://www.gimp.org/downloads/